Sewer pipe elbow die



June 26, 1956 Filed NOV 26, 1954 s. G. GIBBONEY, SR 2,751,658

SEWER PIPE ELBOW DIE 2 Sheets-Sheet l INVENTOR. s'rEwARD G. G\BBONEY 5?- AT TOQNEYS June 6, 1956 s. G. GIBBONEY, sR 2,751,658

SEWER PIPE ELBOW DIE Filed Nov 26, 1954 2 Sheets-Sheet 2 INVENTOR.

STEWAED 6- GIBBONEY 52.

ATToEN EYs United States Patent SEWER PIPE ELBOW DIE Steward G. Gibboney, Sr., Grove City, Ohio Application November 26, 1954, Serial No. 471,146

2 Claims. (Cl. 25-39) This invention relates to a die used in the manufacture of clay pipe elbows.

Conventionally, an L of the kind described is made by hand, in plaster forms. Ordinarily, a right and a left hand die are used, in a form as described, and these are filled with the clay or other plastic material, after which the two halves are placed together. Thereafter the forms with the molded L inside the same are laid aside while the clay or other material dries and pulls away from the forms.

' The main object of the present invention is to provide a die for'making sewer pipe Ls of clay or other material, which will be so designed as to eliminate the making of the Ls by hand in the conventional manner. Instead,

the die constituting theinvention is so designed that the clay material is forced into one end thereof, throughout the length of the die, until the die has been completely filled. Thereafter, an end die member serving as a closure during the filling of the die is removable to open the die and has the effect of extending the completed L through an arcuate path about its own center out of the now open die end. The additional material forced into the die is then used for fashioning another L, after, of course, replacement of the end closure means.

Another object of importance is to provide a die as described which will form a seamless L of strong construction, adapted for connection to conventional adjacent pipe sections.

Still another object is to so design the end closure as to cause the same to cooperate with the adjacent portion of the die in forming a belled end on the completed L.

Yet another object is to so form the die as to permit the attachment of the same to a conventional clay press such as is used in making sewer tile or pipe.

Other objects will appear from the following description, the claims appended thereto, and from the annexed drawing, in which like reference characters designate like parts throughout the several views, and wherein:

Figure 1 is a side elevational view of the die according to the invention, a clay press to which the die is attached being illustrated fragmentarily;

Figure 2 is a top plan view;

Figure 3 is a view similar to Figure l in which the endclosure means has been removed and the L is partially forced out of the die, the end closure means being shown in exploded perspective;

Figure 4 is a transverse sectional view on of Figure 1;

Figure 5 is an enlarged longitudinal sectional view on line 5-5 of Figure 2, the dotted lines showing the pipe being ejected and the clay press also being shown in dotted outline; and

Figure 6 is a transverse sectional view on line 6-6 of Figure 5.

The reference numeral 10 has been applied generally to a conventional clay press, only a fragment of which is shown. The press is equipped with the usual outlet line 4-4 ing the hollow core.

having a circumferential attaching flange 12 formed equidistantly spaced openings through which extend removable connecting bolts 14.

The die constituting the present invention has been generally designated at 16, and includes a sleeve-like outer die member 18 the opposite ends of which are formed open. At its inner end, said die member is provided with a circumferential flange 20 having openings registering with those of the flange 12, whereby to permit extension of the connecting bolts through both flanges to fixedly but removably' connect the die 16 to the clay press in communication with the outlet of said press.

The outer die member has an inner end portion of tapered formation, the flange 20 being rigid with andextending about the larger, inner end of said inner end portion. At its smaller extremity, the inner end portion of the outer die member terminates, throughout its cir cumference, in a plane a-a inclined obliquely at an angle of approximately 15 to a plane b-b intersecting per-.

pendicularly with the axis or longitudinal center line of the inner end portion of the outer die member.

At plane a-a, the inner end portion of the outer member merges into an outer end portion 22 of said die member, and this is curved throughout its length about a radius common to that of the L E to be formed. At; its outer extremity, the portion 22 terminates in a plane c-c inclined, to the extent of approximately 10, oblique-' 1y to the plane b-b. The plane c-c, however, is' in-V clined oppositely to plane a-a, and is disposed at an acute angle of approximately 25 to plane a-a. I

At its outer end, the portion'22 is integrally formed with a circumferential flange 24, the inner surface of The core 28 is also formed, at its inner end, with a tapered inner end portion, the taper of which is opposite to the taper of the inner end portion of the outer die member as best shown in Figure 5. At its larger, outer end, the core 28, like the outer die member, is of circular cross section, the larger end of the tapered part of the core terminating in plane a-a and being concentric with the smaller end of the inner end portion'of outer die member 18. p

At its larger,'outer end, the inner end portion of the, core 28 merges into anarcuate outer end portion 52, curved about the same radius as the outer end portion22,

and spaced from the outer end portion 22 a distance equal to the thickness of the wall of the L E to be formed.

The outer end of the outer end portion 32 terminates in plane 0-0, as shown in Figure 5. Q

At'its inner end, the core 28 is provided with a closure 34 to prevent the clay or other plastic material from enter An end closure generally indicated at 39, is" utiliied" as a die member cooperating with the core and outer die member to define a bell die employed in forming a belled end on the L. The end closure is formed with a relatively thick, circular block 40 having a fiat inner surface on which is formed a low boss 42 having a chamfered edge 44, the boss entering the open outer end of the core 28 when the closure is in its closed position shown in Figure 5, thus properly locating the end closure relative to the core and outer die member. The end closure is also provided with a cup 48 in which the circular block is re- Patented June 26, 1956 die 'movablyen gaged, and'said cup is of an inner diameter equal tothe outer-diameter of' a base circumferential" huge 46 formed on the closure block.

Cup 48 is formed, at its open end, with an internal, circumferential. recess d of angnrarcr ss section 'receivg ing the outer'end of the flange 74.- Adepending an nular lip 51 overlappingly engages the ou er surface of flange 24 to effect a seal at this'point. 7

A handle 52 is fixedly secured to the outer fsuriacelof' the cupbase, and provided upon flange 24, at diametrically opposite locations, are cars 54 to which are pivotally con nected the innerend of arcuate clarnp arms 56 the free ends of which have'teeth58 engaging diametrically oppos'ite'por't'ions of the cup to hold the same 'firr'nly seated" against the core and outer "die member. a

In use, the device 'appears'as in Figure 5, and in this position. of the parts, claylor other plastic material. is-

forced'from the clay press into the space between the core and outer die member; The materiaI fills the mold, flowing into' the space definedby the internal recess '26 and'from this space, the material flows into the bell-formiugspace defined between the circumference of the block .40 or the closure and the skirt of the cup 48; As a result,

theclay press into the mold, forces the molded material out of the die as shown in dotted lines in Figure 5 and as also shown in Figure 3. Due to the fact'that the outer ends of the core and outer die member are curved about i the. radius of the L to be made, the L will move out-of the die through an arcuate path, and when it is of suf ficient length, it is cutoff along the line cc. Thereafter,

, fthe closure is returned to proper position, and the following pl'astic material will again fill the mold, after which the closure is removed for forcing of another L out of the mold. a Y 7 It will'be noted that the bell die 39 is'readily removable from the flange 24 of the outer die member 18, and

the block .40 with its circumferential flange 46 readily removable from the cup 48,'s'o as to facilitate the'produetion ofshort radii Ls since the block 40 need not be taken out through the cup 48, as would be the case if'the cup were fixed to or integral with the outer dien ember;

sarily confined to the specific use or uses thereof described above, since it may be utilized'for any purpose to which it maybe suited. Nor is the invention t'ofbe necessarily limited to the specific construction illustrated and described, since such construction is only intended to be. illustrative of the principles, it being considered that" the invention comprehends any minor change in .con'strucr that maybe permitted within the scope of} the apex pended 'claims.

."Whatis claimed is; V i I. A die for moldingLLs of clay or otherplast'ic material, comprising a tubular outer die memberihavin'g a tapered inner end portion adapted at its"larger-end.for

attachment to a source from which moldable'materiab is'forc'ed under pressure, and having anfouterjend portion extending. from thesmaller end of the inner nd portion It is believed apparent that the invention is not neces and curved about the radius of the L to be formed, said larger'end terminating in a plane substantially perpendicular to the longitudinal center line of the outer die member, said smaller end terminating in a plane oblique to the first plane; a core extending within the outer die member and spaced from the wall thereof to define a mold cavity therebetween, said core having an inner end portion terminating at its opposite ends in the respective planes, the inner end portion extending within and being tapered oppositely to the inner end portion of the outerdie member,

the core having an outer end portion housed-within and g curved correspondingly to the outer end portion of the outer die member, said outer endportions at their outer endsterminating in a plane obliqueiyrelated to both the first named planes; and an end closure removably engageable with the respective outer end portions at the outer extremities thereof. i

2. A die for molding .Ls of clay or other plastic material, comprising; a tubular outer die member having-a tapered inner end. portion adapted at its lar-gerend for attachment to a source from which moldable material is forced under pressure, and having an outer endportion; extending from the smaller end of the inner end portion and curved about the radius'of the L to be formed,. sa id larger end terminating in a plane substantially perpendicular to the longitudinal center line of the outer die member, said smaller end terminating'in a' plane oblique to the. first plane; a core extending within the outer die member and spaced irom the wall thereof to define a mold cavity therebetween, said core having an inner end portion terminating at its opposite ends in the respective planes, the inner end portion extending withiniand being tapered oppositely to the inner end portion of the outer die member, the core having-anouter end, portion housed within and curved correspondingly to the outer end por-;;.-

tion of the outer. die member, said outer end portions at their outer ends terminating in a planeohliguely related to both the first named planes; and an end closure're movably engageable with the respective outer end portions at the outer extremities thereof, said end closure being formed to include a block seatiug against the outer extremity of the coreand formed to a larger diameter than said outer. extremity of the core, thebloclcbeing formed .with an outwardly extending base flange, the

outer extremity of the outer end portion of the enter die member being formed with an internally recessed circumferential flange communicating with the space 'snri I rounding the block and extending tothe'base flange, saidclosure. further including a cup receiving said blockand abutting against the flange of saidouter'end 'po'rtionof the outer die member, whereby to cooperate with the. block and outer die member to form a belied end on said L,. and clamp means carried by the outer die-memberand detachably engageable with said cup to hold the cup and blockagainst the outer die member and core respecti'vely. 1

References Cited in tliefile of this patent V UNITED STATES PATENTS 

